for JEDEC devices without and with extension bytes for non JEDEC devices Signed-off-by: Reinhard Meyer u-boot@emk-elektronik.de --- drivers/mtd/spi/spi_flash.c | 139 +++++++++++++++++++++++++++++-------------- 1 files changed, 94 insertions(+), 45 deletions(-)
diff --git a/drivers/mtd/spi/spi_flash.c b/drivers/mtd/spi/spi_flash.c index ea875dc..099eb4a 100644 --- a/drivers/mtd/spi/spi_flash.c +++ b/drivers/mtd/spi/spi_flash.c @@ -1,8 +1,26 @@ /* - * SPI flash interface + * (C) Copyright 2010 + * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de * * Copyright (C) 2008 Atmel Corporation - * Licensed under the GPL-2 or later. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA */
#include <common.h> @@ -96,13 +114,59 @@ int spi_flash_read_common(struct spi_flash *flash, const u8 *cmd, return ret; }
+/* + * the following table holds all device probe functions + * + * shift: number of continuation bytes before the ID + * idcode: the expected IDCODE or 0xff for non JEDEC devices + * probe: the function to call + * + * non JEDEC devices should be ordered in the table such that + * the probe functions with best detection algorithms come first + * + * several matching entries are permitted, they will be tried + * in sequence until a probe function returns non NULL + * + * IDBUF_LEN may be redefined if a device detection requires + * more then 5 bytes read. + */ +#define IDBUF_LEN 5 +const struct { + const u8 shift; + const u8 idcode; + struct spi_flash *(*probe) (struct spi_slave *spi, u8 *idcode); +} flashes[] = { +#ifdef CONFIG_SPI_FLASH_SPANSION + { 0, 0x01, spi_flash_probe_spansion, }, +#endif +#ifdef CONFIG_SPI_FLASH_ATMEL + { 0, 0x1F, spi_flash_probe_atmel, }, +#endif +#ifdef CONFIG_SPI_FLASH_MACRONIX + { 0, 0xc2, spi_flash_probe_macronix, }, +#endif +#ifdef CONFIG_SPI_FLASH_WINBOND + { 0, 0xef, spi_flash_probe_winbond, }, +#endif +#ifdef CONFIG_SPI_FLASH_STMICRO + { 0, 0x20, spi_flash_probe_stmicro, }, + { 0, 0xff, spi_flash_probe_stmicro, }, +#endif +#ifdef CONFIG_SPI_FLASH_SST + { 0, 0xBF, spi_flash_probe_sst, }, +#endif +}; + struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, unsigned int max_hz, unsigned int spi_mode) { struct spi_slave *spi; - struct spi_flash *flash; + struct spi_flash *flash = NULL; int ret; - u8 idcode[5]; + int shift; + int i; + u8 idbuf[IDBUF_LEN]; + u8 *idp;
spi = spi_setup_slave(bus, cs, max_hz, spi_mode); if (!spi) { @@ -117,53 +181,38 @@ struct spi_flash *spi_flash_probe(unsigned int bus, unsigned int cs, }
/* Read the ID codes */ - ret = spi_flash_cmd(spi, CMD_READ_ID, &idcode, sizeof(idcode)); + ret = spi_flash_cmd(spi, CMD_READ_ID, &idbuf, sizeof(idbuf)); if (ret) goto err_read_id;
- debug("SF: Got idcode %02x %02x %02x %02x %02x\n", idcode[0], - idcode[1], idcode[2], idcode[3], idcode[4]); - - switch (idcode[0]) { -#ifdef CONFIG_SPI_FLASH_SPANSION - case 0x01: - flash = spi_flash_probe_spansion(spi, idcode); - break; -#endif -#ifdef CONFIG_SPI_FLASH_ATMEL - case 0x1F: - flash = spi_flash_probe_atmel(spi, idcode); - break; -#endif -#ifdef CONFIG_SPI_FLASH_MACRONIX - case 0xc2: - flash = spi_flash_probe_macronix(spi, idcode); - break; +#ifdef DEBUG + printf("SF: Got idcodes\n"); + print_buffer(0, idbuf, 1, sizeof(idbuf), 0); #endif -#ifdef CONFIG_SPI_FLASH_WINBOND - case 0xef: - flash = spi_flash_probe_winbond(spi, idcode); - break; -#endif -#ifdef CONFIG_SPI_FLASH_STMICRO - case 0x20: - case 0xff: /* Let the stmicro func handle non-JEDEC ids */ - flash = spi_flash_probe_stmicro(spi, idcode); - break; -#endif -#ifdef CONFIG_SPI_FLASH_SST - case 0xBF: - flash = spi_flash_probe_sst(spi, idcode); - break; -#endif - default: - printf("SF: Unsupported manufacturer %02X\n", idcode[0]); - flash = NULL; - break; - }
- if (!flash) + /* + * count the number of continuation bytes, but + * leave at least 3 bytes to the end of the buffer untouched + */ + for (shift = 0, idp = idbuf; + shift < (sizeof(idbuf) - 3) && *idp == 0x7f; + shift++, idp++) + ; + + /* search the table for matches in shift and id */ + for (i = 0; i < ARRAY_SIZE(flashes); i++) { + if (flashes[i].shift == shift && flashes[i].idcode == *idp) { + /* we have a match, call probe */ + flash = flashes[i].probe(spi, idp); + if (flash) + break; + } + } + + if (!flash) { + printf("SF: Unsupported manufacturer %02X\n", *idp); goto err_manufacturer_probe; + }
spi_release_bus(spi);